/* 基础样式 */
body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 0;
    color: #2d3748;
    line-height: 1.6;
    background-color: #f8fafc;
}

/* 导航栏 */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: static;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 80px;
    height: 80px;
    object-fit: cover;
}

.team-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: #0ea5e9;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #2d3748;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #0ea5e9;
}

/* 主视觉区域 */
.hero {
    background: linear-gradient(135deg, #1e3a8a, #0ea5e9);
    color: #fff;
    padding: 40px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

/* 功能区块 */
.features {
    max-width: 1400px;
    margin: 40px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

@media (max-width: 1200px) {
    .features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .features {
        grid-template-columns: 1fr;
    }
}

.feature-item {
    text-align: center;
    padding: 20px 15px;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 280px;
}

.feature-item h2 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.feature-item .download-btn {
    margin-top: 15px;
    align-self: center;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-item h2 {
    color: #1e3a8a;
    margin-bottom: 10px;
}

.feature-item p {
    margin-bottom: 10px;
}

/* 页脚 */
footer {
    background: #1e3a8a;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
    margin-top: 80px;
}

/* 帮助和关于页面 */
.help-content, .about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.help-content h1 {
    text-align: center;
    margin-bottom: 40px;
    color: #1e3a8a;
}

.faq-section, .contact-section {
    margin-bottom: 40px;
}

.faq-section h2, .contact-section h2 {
    color: #1e3a8a;
    margin-bottom: 20px;
    border-bottom: 2px solid #0ea5e9;
    padding-bottom: 10px;
}

.faq-item {
    margin-bottom: 20px;
}

.faq-item h3 {
    color: #1e3a8a;
    margin-bottom: 10px;
}

.faq-item p {
    color: #4a5568;
    line-height: 1.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}
